Engineering - September 2007

I am afraid to just screw right into it, because I'm pretty sure it will crack. If I use a pilot drill it, will that be enough to keep it from cracking. Or could I drill and tap it. And then just screw it together that way. Will the threads be strong enough to hold it in. If this will not work. What are my options for joining them.

The joints will be butt joints not angled. And they will be holding water. And maybe ethylene glycol (antifreeze) in a 50-25 percent mix with water. But I'm not sure if Lexan is rated to hold this chemical.

2007-09-18 11:08:27 · 2 answers · asked by Anonymous

also in a geartrain with 4 gears and a 1:5 ratio in each, is it impractical to hope to get 2500rpm out of the last gear if the first is spun by hand?

2007-09-18 10:44:11 · 2 answers · asked by import600 2

Its for a school project, they only let you use balsa wood and super glue. i thought mayble cut the plank into strips and glue em together to form a strong regulangular shape.
Any tips

2007-09-18 09:55:32 · 4 answers · asked by peter s 1

Looking for the smallest size battery to run 1mm LED. If it can run for more than 6 hours it would be fine. Any alt configurations would be helpful.

2007-09-18 09:49:24 · 4 answers · asked by Anonymous

I need to build two boxes, one to hold 50 gallons of water and the other to hold 100 gallons of water and to fit in the back of a pick up truck. What size should I build them?

2007-09-18 09:42:03 · 4 answers · asked by AV23 2

To get oil from the crude oil, polymer has been used. what is the role of polymer and how to get rid of it from the waste water?

2007-09-18 09:25:00 · 1 answers · asked by Heseri 1

i need to know for a practice exam paper im having trouble with

2007-09-18 08:51:12 · 15 answers · asked by joebeina 1

My invention is a tent with propellers. It's similar to a helicopter but it's also different at the same time. It is fueled by gasoline, ( thinking of making it solar powered). Its for all ages and it can get you where you need to be quicker and easier. Its built with a navagation system, blue toothed technology, and weather and climate indicator. Also it has built- in automatic doors and much more! I hope it be a big time seller ($1 million dollars).

2007-09-18 08:33:45 · 8 answers · asked by Darrell M 1

I am trying to get the technical details about sound system like what is ohm why some have 4 and some have 8, what is the significance what is frequency response etc .. any site on which the details available ?

2007-09-18 07:15:15 · 2 answers · asked by rajesh g 1

I'm a noob but want to begin designing an EV motorcycle. I know the very basics at this stage.

To get better range, I want to use some larger 12V batteries along with lighter ones. The voltage will be regulated with a suitable controller (Alltrax 7245).

So I'm proposing:
12V 27Ah x4
12V 51Ah x2

But I've heard that batteries should be matched and have the same rating. Aside from recharging hassles, are there any other reasons?
The batteries I'd like to use are Hawker SBS30 and SBS60 absorbed glass mat types.

Thanks!

2007-09-18 06:49:08 · 4 answers · asked by mcmontecarlo 2

i have the numbers , need to know how many turns right and
left. only 3 numbers.
thanks

2007-09-18 06:41:14 · 1 answers · asked by augie1 1

to learn

2007-09-18 05:25:20 · 3 answers · asked by Aishwarya s 2

what are lissajous figures?what are their use?
Show that the resultant of two shms of the same period but different amplitudes and phases is an elliptical motion.For what condition will the path of the resultant motin be a circle and a straight line.....?

2007-09-18 05:05:19 · 3 answers · asked by goerge 1

2007-09-18 04:18:01 · 2 answers · asked by Anonymous

Smaller and sharper gives better resolution, but maybe wider and blunter gives more force?

2007-09-18 03:42:04 · 3 answers · asked by duh 2

2007-09-18 03:41:29 · 4 answers · asked by JAMES 4

I have a 12V, 800mA DC Adepter. I want to use it as a variable voltage supplier, then how can a potentiometer be use for varying that 12V? A simple application(connecting output of adepter to fixed terminals of potentiometer as input , any of fixed terminals and terminal of slider as output) doesn’t work for high load application (I > 0.3A) . By doing this sparking appears in potentiometer and it burnout.

2007-09-18 03:10:14 · 1 answers · asked by harsh2035 1

The connection is p-n-n+-n-p. Can it be considered a pnp bipolar junction transistor?

2007-09-18 03:09:42 · 3 answers · asked by duh 2

2007-09-18 02:56:50 · 2 answers · asked by Anonymous

2007-09-18 02:49:30 · 2 answers · asked by JAMES 4

Often you see the phrase associated with high voltage plasma tubes and lasers. I always fail to comprehend the meaning. I guess an increase in the flow of electrons (like a battery) but what about conservation of charge (Kirchhoff's current law), should there not be a deficit elsewhere, is it just that the electrons are accelerated? As you can see i am confused, anyone with any insight into this???

2007-09-17 21:51:06 · 1 answers · asked by Paine 6

I want to calculate the backup duration of 1 KVA UPS in fully charged condition when there is load of 200 watts to it. Any body can please tell me the formula for it ? Thanks in advance.

2007-09-17 21:23:11 · 8 answers · asked by TheHonest 1

Engineering, civil field

2007-09-17 21:04:00 · 5 answers · asked by Anonymous

If so, how?

2007-09-17 20:45:21 · 7 answers · asked by Anonymous

I'm working on a fluid mechanics problem of finding the location of a vertical force on a curved surface. I'm trying to follow the solutions but don't understand one step. I know you have to sum the area moments. I'm familar with moments from statics, but never did moments with areas. The equation they give is 31.7x + 28.3(2.55)= (10x6)3. I understand the equation area*d+area*d=??? I don't understand where they got (10x6)3. I know it's hard without any pictures but generally what's it supposed to equal to? the problem is a cross section of a tank and has a cylindrical surface with r=6ft and h=10ft and contains water. This problem 3.8.7 in Fluid Mechanics by Finnemore. Thanks!!

2007-09-17 20:32:47 · 1 answers · asked by tegra977 1

In maximum mode, bus controller 8288 generates controls signals like ALE, WR, DEN, DT/R etc. But RD(read) signal is generated by 8086. What is the reason for this??

2007-09-17 20:32:23 · 1 answers · asked by Rohan C 1

Thanks for answering!

2007-09-17 20:03:56 · 3 answers · asked by Sarah C 1

2007-09-17 19:51:49 · 1 answers · asked by ayeesha F 1

plz provide a link or the name of the book.
also do not provide a simple answer of one or two words, a description must be provided

thnx

2007-09-17 18:47:03 · 4 answers · asked by Similo 1

2007-09-17 18:44:54 · 4 answers · asked by JAMES 4